The quality of Utah’s air was in the news a great deal during the last winter. Prolonged inversions along the Wasatch Front, coupled with concerns and miscalculations of air quality in the Cache Valley raised voters’ awareness of the issue. So how bad is Utah’s air? The answer depends quite a bit on which measure of air quality is being used. Those measures are tied to the standards set by the Environmental Protection Agency (EPA) under the Clean Air Act.